对大多数人来说，他们自然环境辐射剂量的一半以上来自氡—一种可聚集在家庭、学校和工作场所的放射性气体。

For most people more than half of their natural background radiation dose comes from radon, a radioactive gas that can accumulate in homes, schools and workplaces.

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必须将以单剂瓶取代所有多剂量瓶的环境成本考虑在内。

The environmental cost of replacing all multi-dose vials with single-dose vials must be taken into consideration.

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然而对于数量不多的生活在全球已知高辐射环境地区的人们来说，每年的剂量可超过20 mSv。

However, for a limited number of people living in known high background radiation areas of the world, doses can exceed 20 mSv per year.

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If a cell has a gene that makes it resistant to Ampicillin, that means that that micro-organism can survive being exposed to this normally deadly chemical without dying.

如果细胞带有一种基因,能够让它对氨苄青霉素产生抗性,即使把它放在,有致死剂量化学物质的环境中,它也能存活下来

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